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"If you are concerned about you or a friend approach some help from stewards or present to one of the onsite medical centres.”

The police reiterated a similar message and also asked for anyone with information to come forward and speak to the Police.

Detective Inspector Paul Grounds said: "These are the early stages of our investigation but I want to reassure those affected that we are doing everything possible to identify exactly what substance or substances have resulted in these severe reactions, working alongside the health service.

"We initially believe that ecstasy tablets were taken by some of those in hospital but this is all subject to further enquiries.

“I would urge anyone else who has had an adverse reaction to any substance make themselves known to medical services as soon as possible.

"Likewise, if you are still in possession of any drugs from the event, please do not take them under any circumstances but let us know and we will recover them for further enquiries to be made."

This is not the first time in 2018 festival-goers have been at risk from poor quality ecstasy pills.

Georgia Jones, 18, and Tommy Cowan, 20, both of Havant, Hants, died while at the Mutiny Festival in Portsmouth in May.

They were among 15 people from the event who were hospitalised.

An inquest at Portsmouth Coroner’s Court heard the pair had each taken two “rogue” ecstasy pills at the event before being rushed to hospital.

Anyone with information is asked to call police on 101 or Crimestoppers anonymously on 0800 555111.